Hi Karn
I totally agree with Unlocker on this point:
Makes no sense having a weather sealed body without the weather sealed lens to go with it!
Bearing in mind the range of extreme weather environments that I imagine you might invariably encounter outdoors during a typically severe Swedish winter, it surely seems pretty unrealistic and also a false economy to purchase a weather-sealed K20D body and then expect non-weather sealed 3rd party lenses to perform to the same standard ?
When you said:
What made me look into Pentax in the first place was the weather sealing, I plan to use my camera and everything that helps to protect it when doing so is in my opinion a great thing to have. I DO plan to bring the k20d on every ski-trip and mountain hike, so I do rate weather-sealing very highly in that regard.
Naturally this issue would not be such a problem if you were using conventional lenses indoors or outdoors during dry weather conditions, but torrential downpours or freezing sleet are another prospect entirely !
Although I own the Tamron 18-250mm & Sigma 10-20mm lenses and they are indeed excellent products in their own right, I would NEVER DREAM of using either of them in heavy rain or freezing sleet, without adequately protecting them somehow !
Best regards
Richard